Datasheet

198
7734Q–AVR–02/12
AT90PWM81/161
16.4.2 AC2CON - Analog Comparator 2 Control Register
• Bit 7– AC2EN: Analog Comparator 2 Enable bit
Set this bit to enable the analog comparator 2.
Clear this bit to disable the analog comparator 2.
• Bit 6– AC2IE: Analog Comparator 2 Interrupt Enable bit
Set this bit to enable the analog comparator 2 interrupt.
Clear this bit to disable the analog comparator 2 interrupt.
• Bit 5, 4– AC2IS1, AC2IS0: Analog Comparator 2 Interrupt Select bit
These two bits determine the sensitivity of the interrupt trigger.
The different setting are shown in Table 16-3.
• Bit 3– Reserved
• Bit 2, 1, 0– AC2M2, AC2M1, AC2M0: Analog Comparator 2 Multiplexer register
These three bits determine the input of the negative input of the analog comparator.
The different setting are shown in Table 16-4.
Bit 7 6543210
AC2EN AC2IE AC2IS1 AC2IS0 - AC2M2 AC2M1 AC2M0 AC2CON
Read/Write R/W R/W R/W R/W -R R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Table 16-3. Interrupt sensitivity selection.
AC2IS1 AC2IS0 Description
0 0 Comparator Interrupt on output toggle
01Reserved
1 0 Comparator interrupt on output falling edge
1 1 Comparator interrupt on output rising edge
Table 16-4. Analog Comparator 2 negative input selection.
AC2M2 AC2M1 AC2M0 Description
000“V
REF
”/6.40
001“V
REF
”/3.20
010“V
REF
”/2.13
011“V
REF
”/1.60
100Band gap voltage
101DAC result
110Analog comparator negative input (ACMPM2 pin)
111Analog comparator negative input (ACMPM pin)